Cosmic flexion
Cosmic flexion
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DOI：
10.1103/physrevd.105.123521
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发表时间：
2022-03
影响因子：
5
通讯作者：
Evan J. Arena;D. Goldberg;D. Bacon
中科院分区：
文献类型：
--
作者：
Evan J. Arena;D. Goldberg;D. Bacon
宇宙弯曲和宇宙切变一样，是一种关联函数，其信号来源于宇宙的大尺度结构。在宇宙切变观测成功的基础上，随着大规模宇宙学数据集前所未有的高质量，探索宇宙弯曲的实际制约因素的时机已经成熟。与具有宽窗功能的宇宙剪切不同，宇宙弯曲只能在小尺度上测量，因此可以独特地限制小尺度物质的功率谱。在这里，我们提出了一个完整的宇宙弯曲的理论形式，包括弯曲-弯曲和剪切-弯曲两点关联。我们在暗能量调查(DES)中提出了测量宇宙弯曲的预测，这是一项第三阶段的宇宙学调查，并对即将到来的第四阶段实验中测量这些宇宙弯曲信号的未来前景进行了评论。
Cosmic flexion, like cosmic shear, is a correlation function whose signal originates from the large-scale structure of the universe. Building on the observational success of cosmic shear, along with the unprecedented quality of large-scale cosmological datasets, the time is ripe to explore the practical constraints from cosmic flexion. Unlike cosmic shear, which has a broad window function for power, cosmic flexion is only measurable on small scales and therefore can uniquely place constraints on the small-scale matter power spectrum. Here, we present a full theoretical formalism for cosmic flexion, including both flexion-flexion and shear-flexion two-point correlations. We present forecasts for measuring cosmic flexion in the Dark Energy Survey (DES), a Stage III cosmological survey, and comment on the future prospects of measuring these cosmological flexion signals in the upcoming era of Stage IV experiments.